<template>
  <view>  
    <!-- 使用自定义的搜索组件 -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <scroll-view scroll-y :style="{height: wh + 'px'}" class="left-scroll-view">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">
            {{ item.cat_name }}
          </view>
        </block>
      </scroll-view>
      <scroll-view scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <!-- 二级分类 -->
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">/ {{ item2.cat_name }} /</view>
          <!-- 三级分类盒子 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotGoodsList(item3)">
              <image :src="item3.cat_icon" mode="widthFix"></image>
              <text>{{ item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        // 当前设备的可用高度
        wh: 0,
        // 分类列表数据
        cateList: [],
        // 左侧菜单默认激活项
        active: 0,
        // 二级分类数据
        cateLevel2: [],
        // 重置二级分类滚动条的位置
        scrollTop: 0
      };
    },
    onLoad() {
      const syncInfo = uni.getSystemInfoSync()
      // console.log(syncInfo)
      this.wh = syncInfo.windowHeight - 50
      // 调用获取分类列表函数
      this.getCateList()
    },
    methods: {
      // 获取分类列表数据
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/categories')
        console.log(res)
        if (res.meta.status !== 200) return uni.$showMsg('获取分类列表数据失败')
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      // 监听左侧菜单栏的点击事件
      activeChanged(id) {
        this.active = id
        this.cateLevel2 = this.cateList[id].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      // 监听三级分类的点击事件
      gotGoodsList(item) {
        uni.navigateTo({
          url: `/subpkg/goods_list/goods_list?cid=${item.cat_id}`
        })
        console.log(item)
      },
      // 监听search组件的点击事件
      gotoSearch () {
        uni.navigateTo({
          url: "/subpkg/search/search"
        })
      }

    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        background-color: #f7f7f7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;

        &.active {
          background-color: #ffffff;
          position: relative;

          &::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 30px;
            background-color: #c00000;
          }
        }
      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }

  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      width: 33.33%;

      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px;
      }
    }
  }
</style>
